Motor cleaner



Patented Apr. 21, 1942 UNITED STATES PATENT OFFICE MOTOR CLEANER George Esko, Esko, Minn.

Application May 14, 1941, Serial No. 393,456

3 Claims.

This invention aims to provide a simple and inexpensive but efiectiv tool adapted to be used, for instance, in cleaning out the guide tube in an internal combustion engine, so that the valvegrinding bushing can be inserted and removed readily.

Fig. 1 shows in elevation, a tool constructed in accordance with the invention, the view being diagrammatic as to the actual relation existing between the tool and an internal combustion engine whilst the cleaning operation is going forward;

Fig. 2 is a side elevation showing a portion of the body of the tool;

Fig. 3 is a cross section on the line 3--3 of Fig, l.

The tool includes an elongated, loop-shaped, one-piece body I, made of resilient strip metal and including parallel side arms 2, having converging extensions 3, merging into a tang 4 secured in a handle or similar operating means 5, disposed coaxially with respect to the body I.

In their outer edges, and intermediate their ends, the arms 2 have transverse slits 6, defining wings I, the corners of which are bent inwardly to form fingers 8 engaging and retaining the terminal convolutions of a helical compression spring 9, which abuts against the arms 2. The construction is such that it is not necessary to provide retaining studs on the arms 2, in order to hold the spring 9 in place.

Hardened steel scrapers III are located on the outer surfaces of the arms 2 and extend longitudinally thereof. The scrapers II! are duplicates and are of right-triangular cross section. By turning one scraper I end-for-end with respect to the other, the hypotenuses of the triangles will be brought into parallelism, as shown in Fig. 3, and the sharpened edges of the scrapers will be so disposed that both of them will be effective when the tool is rotated in a single direction. The scrapers II! are so mounted on the arms 2 that the spring 9 is disposed midway between their ends. Thus, the spring 9 is made peculiarly effective, and the arms are reinforced to receive the thrust of the spring.

The scrapers Ill are supplied at their ends with recesses I I, defining thinned parts I2, and in the said parts are located securing elements I4, which fasten the scrapers ID to the arms 2. Because the scrapers II) are recessed as shown at II, the securing elements I4 will not interfere with the engagement between the sharpened edges of the scraper and the part to be cleaned, if the securing elements do not happen to be of the countersunk variety shown in Fig. 3.

The tool is inserted into the article to be cleaned, for example the valvetube I5 of aninternal combustion engine, and is rotated, the scrapers clearing the valve tube of carbon, for

the reception of the valve-grinding bushing (notshown).

When the tool is in use, the resilient arms 2 are concaved toward each other, and tend to press the scrapers outwardly, into intimate contact with the inner surface of the tube I5. More particularly, the strong spring 9 urges the cutters IU outwardly into contact with the inner surfac of the valve tube or other object.

Fig. 1 has been prepared with a view to showing the application of the tool, and the normal form of the tool. The arms 2, therefore, are not shown as concaved toward each other, nor is the spring 9 shown under compression.

The article is recommended by its simplicity and especially by the loop-shaped body I.

A mechanic who abides by what is claimed may make changes in the precise form shown and described without departing from the spirit of the invention,

Having thus described the invention, what is claimed is: I

l. A cleaner for the valve tubes of internal combustion engines and the like, comprising a resilient, loop-shaped body including opposed arms, operating means assembled with one end of the body, scrapers located on the outer surfaces of the arms, and a helical compression spring disposed between the arms and located between the scrapers, the arms having transverse slits defining wings, the wings comprising inwardly extended parts engaging the terminal convolutions of the spring.

2. A cleaner for the valve tubes of internal combustion engines and the like, comprising a resilient, loop-shaped body including opposed arms, operating means assembled with one end of the body, scrapers located on the outer surfaces of the arms, the scrapers having recesses defining thinned terminal parts, securing elements connecting said parts with the arms, and a compression spring disposed between the arms.

3. A cleanerfor the valve tubes of internal combustion engines and the like, comprising a resilient, loop-shaped body including opposed arms, operating means assembled with one end of the body, scrapers located on the outer surfaces of the arms, and a compression spring disposed between the arms, the arms having transverse slits defining wings, the corners of the wings being inclined inwardly, to engag the ends of the spring.

GEORGE ESKO. 

